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Ron Livingston has joined the cast of HBO’s Boardwalk Empire as a new series regular for the period drama’s upcoming fourth season. He will play Roy Phillips, a wealthy out-of-town businessman who catches the eye of Gillian Darmody (Gretchen Mol) [oh lawd]. Season 4 is currently in production and will debut later this year. This marks Livingston’s return to HBO where he co-starred on the Emmy-winning Sex And The City, Band Of Brothers and, most recently, Game Change.